package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * 消费者
 */
public class ConsumerQuickStart {

    public static void main(String[] args) {
        //1.kafka的配置信息
        Properties properties = new Properties();
        //连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.136.152:9092");
        //反序列化的key和value
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        //设置消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"gruop1");
        //手动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG,"false");
        //2.创建消费者对象
        KafkaConsumer<String,String> consumer = new KafkaConsumer<String,String>(properties);
        //3.订阅主题
        consumer.subscribe(Collections.singletonList("itcast-topic-out"));
        //4.拉取消息 每一秒钟拉取一次
        //同步提交和异步提交偏移量
        try{
            while(true) {
                //模拟正在监听状态
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println(consumerRecord.key());
                    System.out.println(consumerRecord.value());
                    System.out.println(consumerRecord.offset());
                    System.out.println(consumerRecord.partition());
                }
                //异步提交偏移量
                consumer.commitAsync();
            }
        }catch (Exception e){
            e.printStackTrace();
            System.out.println("记录错误的信息："+ e);
        }finally {
            //同步
            consumer.commitSync();
        }

        //while(true){ //模拟正在监听状态
        //    ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
        //    for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
        //        System.out.println(consumerRecord.key());
        //        System.out.println(consumerRecord.value());
        //        System.out.println(consumerRecord.offset());
        //        //System.out.println(consumerRecord.partition());
        //        //try{
        //        //    //同步提交偏移量
        //        //    consumer.commitSync();
        //        //}catch (CommitFailedException e){
        //        //    System.out.println("记录提交失败的异常："+ e);
        //        //}
        //        //异步提交当前最新的偏移量
        //        //consumer.commitAsync(new OffsetCommitCallback() {
        //        //    @Override
        //        //    public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
        //        //        if(e!=null){
        //        //            System.out.println("记录错误的提交偏移量："+map+",异常信息"+e);
        //        //        }
        //        //    }
        //        //});
        //    }
        //}
    }
}